When adding a Sonos Player, you may encounter an alert informing you that the app was unable to find any Sonos Players on your network. There are several reasons why this may occur.
Your Sonos Player is unplugged from power
Your mobile device may be connected to a different Wi-Fi network than your Sonos Player or your mobile device may be connected to cellular only.
Your home's internet router or modem is not functioning properly
Basic Troubleshooting
Ensure that your Sonos Player is connected to a working power outlet. If your Sonos Player is connected via ethernet, check that the ethernet cable is firmly seated. It may be helpful to unplug and reinsert the ethernet cable.
Check to see if you can control your Sonos Player from the Sonos App on your mobile device.
Confirm that your internet router and cable or DSL modem are connected to power and turned on. Learn how to Identify your router and cable or DSL modem.
Try restarting your router and cable or DSL modem.